A senior military officer who oversees research into psychic abilities. He listens closely to the three Esper children, and seeks to capture Tetsuo to exploit his powers. A honor-driven and uncompromising man, the Colonel ends up overthrowing the Neo-Tokyo government in both the anime and manga, viewing them as corrupt and self-serving. Despite his physical size, he relies on his forces, as well as the Caretaker robots and the satelite weapon SOL to achieve his aims.